30x55mm grenade, anyone know what this is?

Plastic case

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Jestertoo, your case is aluminum:

It’s plastic. Definitely not Aluminum.

Thanks for the link, don’t know why I wrote x55mm

Umm, for the same reason you wrote 50mm? :-)

Nah, check again please, so far no plastic cases have shown up and it would not make any sense technically as the case forms part of the high pressure chamber.

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Well that’s a big surprise!

I fully agree!!!

Just to make sure, is the case semi-rimmed or rimless?